there is no mention to fastboot flashing unlock_critical step in the Lineage instructions for this device,
there is no mention to fastboot flashing unlock_critical step in the /e/ instructions for others pixel devices,
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so, are you sure fastboot flashing unlock_critical then fastboot flashing lock_critical steps are needed, for this device ?
in reference to the discussion there : Easy installer pixel 7 gros souci
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also there is no link to avb custom key in the /e/ instructions for this device